Description: Preparing for PG entrance examinations! Solve these questions. I bet it will help you.

Keywords: GATE, CSIR, UGC, NET, Biology, Biochemistry, Biotechnology

The term to define gene as a unit of genetic function a region of DNA which encodes a specific product is known as

A cistron is a term used to describe the locus responsible for generating a protein. It can also be defined as the segment of DNA that contains all the information for production of a single polypeptide.
Cistron
Operon
Muton
Recon

Virus that affects E. coli is called

The lack of pigmentation is called albinism, it is due to a recessive allele ‘a`. Two normal parents have albino child. What will be the probability of the next child will be albino?

¼
1/16
½
0

The base present in Lecithin is

Phosphatidylcholine or lecithin has choline as nitrogenous base and it belongs to the family of phospholipids.
Choline
Serine
Ethanolamine
Ionositol

The Enzyme Nitrilase convert

Nitrilase enzymes catalyses the hydrolysis of nitriles to carboxylic acids and ammonia, without the formation of "free" amide intermediates. Nitrilases are involved in natural product biosynthesis and post translational modifications in plants, animals, fungi and certain prokaryotes.
lndole acetonitrile to IAA
IAA to Indole acetonitrile
Indole pyruvic acid to IAA
Tryptamine to IAA

A family has 5 daughters probability of 6th child being girl will be

The probability of production of sperm cells containing a Y chromosome is same as the probability of production of sperm cells containing X chromosome. Hence the chance of the resulting zygote being XX or female is always 1 in 2.
1 in 2
1 in 5
1 in 3
1 in 6

A monocentric chromosome with a central centromere is known as

Metacentric chromosomes have their centromere located exactly in the centre and the two arms are of the same length. Such a chromosome assumes the shape of 'V' during anaphase.
Metacentric
Sub metacentric
Monocentric
Acrocentric

The first stable organic product of Carbon fixation in Photosynthesis is

Phosphoglyceric acid
Glucose
Starch
Pyruvic acid

A double bond consists of

A double bond consists of a sigma bond (using hybrid orbitals) and a pi bond (using p orbitals).
Two alpha bonds
Two pi bonds
One alpha and one pi bond
None

The first enzyme that reduces Nitrates to Nitrite and Ammonia in Plants is

A Ketogenic aminoacid among the following is

A ketogenic amino acid is an amino acid that can be converted into ketone bodies through ketogenesis. This is in contrast to the glucogenic amino acids, which are converted into glucose. In humans, two amino acids are exclusively ketogenic: leucine and lysine.
Leucine
Alanine
Glycine
Serine

An anaerobic organism that can only survive in parasitizing the host is known as

An obligate parasite is a parasitic organism that cannot live independently of its host.
Obligate parasite
Obligate anaerobe
Saprophyte
Derobe